Unraveling the interactions of reductants and reaction path over Cu-ZSM-5 for model coal-gas-SCRviaa transient reaction study

Abstract

with coal gas can be a solution for NOx emission control in iron and steel industry, nevertheless the coal-gas- is not clearly understood and hard to study due to the...

Constructing active copper species in Cu-zeolites for coal-gas-SCR and elucidating the synergistic catalytic function of CuO and Cu2+ ion species

“…Based on a previous study, 17 we screened more Cu modified zeolite catalysts with different topological structures ( e.g. ZSM-5, SSZ-13, and SAPO-34) for the coal-gas-SCR process (Fig.…”

“…If coal gas could be used instead of ammonia as the reducing agent, it will have great benefit on the investment cost and operation cost of deNO x for the iron and steel industry due to easier access and the much lower price of coal gas. Based on the enormous practical implication prospect in the iron and steel industry, the selective catalytic reduction of NO by coal-gas (coal-gas-SCR) was first proposed and studied over Cu-zeolites in our previous work, 17 in which interactions between reductants (CO, H 2 , and CH 4 ) and mechanisms were clarified. However, for this complicated reaction system, the structure-function relationship for Cu-zeolite catalysts is still undone.…”

Revealing the crystal facet effect on N2O formation during the NH3-SCR over α-MnO2 catalysts

“…Compared with the traditional commercial V 2 O 5 -WO 3 /TiO 2 catalysts, many studies have focused on the development of low-temperature SCR catalysts, including metal oxide-based catalysts, like Fe, 13,14 Mn, 15,16 Ce, 17 Cr, 18 W, 19 Cu, 20,21 and zeolite-based catalysts, like CuSn/ZSM-5 22 and Cu-ZSM-5. 23 Among various catalysts, manganese-based catalysts have been widely studied and applied due to their low cost and outstanding low-temperature denitrication performance, whereby their abundant Lewis acid sites, variable valence states of Mn, and strong redox ability contribute to their excellent catalytic activity at low temperature, especially under 200 °C. 10,[24][25][26][27] For instance, Yang et al 28 found that a-MnO 2 exhibited the most superior SCR performance for NO x conversion compared with other crystal phases of b, g, and d-MnO 2 at a lower temperature of 50-120 °C.…”